Photometric detector assembly which includes a housing, means for passing an optical beam along a path through the housing to a detector, a NIST traceable calibration filter enclosed within the housing, and a remotely operable actuator for moving the filter into and out of the beam path. A method for producing a preformed structure composed of the stepped semi-hardened product and a simple shaped semi-hardened product is also provided. The apparatus also includes a profile module maintaining a trust indicator for each operating status. Other advantages of particular embodiments will be apparent from a consideration of the drawings and ensuing description. The enlarging and displaying section enlarges the preview image at the magnification to obtain an enlarged preview image and causes the display section to display a portion of the enlarged preview image.